Revision for any topic or chapter right before the exam is like an extra dose of confidence and surety for students who aspire to perform well in the exams. But what a student needs more importantly than the time or drive to revise well is the availability of reliable study notes and revision material. Given below are some short and precise things to consider when revising CBSE class 9 chapter ‘Sound'. Some important points of Revision are: Important definitions and short note answers:

• Sound and its importance
• Characters of a Sound Wave
• Type of energy that Sound is
• Definition of a Mechanical wave and its properties
• Types of Waves: Longitudinal and Transverse
• What is a wave front?
• What are electromagnetic waves? Give examples.
• What is the speed of sound in different mediums?
• Factors that affect the speed of sound
• Propagation of Sound
• Density-distance graph and the representation of the wave in it
• Definition of a Wave number
• Relation between Speed, Frequency and Wave Length
• Definitions of Wave length, frequency, time period, amplitude and oscillation

Practical numerical questions related to distance-time interval of successive compressions Numerical problems based on Echo Numerical problems related to speed-distance relation of sound Diagram of the human ear with labels on important parts and functions Questions related to wave and its medium Multiple Choice questions

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